fbt造句

• Meanwhile , the paper also discusses some methods to improve the polishing processes , i . e . using the liquid - drop method to monitor the remaining width of the cladding in time . finally , the feasibility of the three kinds of coupling method ? fbt , hf acid etching and the side - polishing are discussed and compared
  最后,对熔融拉锥法、氢氟酸腐蚀法和边研磨法三种方法的可行性进行了分析与比较,得出一套比较适用于光纤窃听的设计方案。
• The increasing of single channel capacities and evolution of optical networks topology , from simple point - to - point to intelligent optical networks , call for strict demands to optical filters . in this paper , the crucial technologies of optical filters such as interleaver , optical digital filter , fused biconical taper all - wave coupler as well as polarization - pump combiner have been studied experimentally and theoretically , which include : 1 . a new process , cascaded fbt ( fused biconical taper ) with precise control as well as strict interference arm length difference , is proposed for the first time to our knowledge
  单信道速率不断提高以及网络拓扑由单一的点对点传输向可上下载的环网和可动态选择波长路由的智能型格形光网络演进，对光滤波器的常规性能指标、时域特性和动态可调谐特性提出了更加苛刻的要求，鉴于此，本论文全面研究了全光纤熔锥型奇偶交错滤波技术、数字光滤波技术、基于g - t全通滤波器的奇偶交错滤波技术以及熔锥型全波耦合器和偏振泵浦合波器。
• In the beginning , the development history and the current development of the technique of fiber detection are introduced briefly . then , discussed in detail are strong coupling theory concerning the fbt coupler and the weak coupling theory concerning the hf acid etching and the side - polishing coupler . from the analysis of fiber coupling equations , the solution of the equation and the formula of the coupling coefficient are derived
  本文首先概述了光纤窃听技术的发展历程和现状,有针对性地分析了关于光纤窃听技术中的光纤耦合问题,并详细介绍了用于熔融拉锥耦合器的强耦合理论和用于氢氟酸腐蚀与边研磨光纤耦合器的弱耦合理论;分析了耦合模方程,得出了耦合模方程的形式解,推导出耦合系数的计算公式。